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Finding the Third Proportional to 261.25 and 392.75

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Solution

The third proportional to 261.25 and 392.75 is: 590.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.25 : 392.75 = 392.75 : x
  2. Step 2: Convert to fraction form
    261.25/392.75 = 392.75/x
  3. Step 3: Cross multiply
    261.25x = 392.75 × 392.75
  4. Step 4: Simplify right side
    261.25x = 154,252.56
  5. Step 5: Solve for x
    x = 154,252.56/261.25
  6. Step 6: Final answer
    x = 590.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.